P0303 Volkswagen -

Question

I've got an 06 gti that's throwing code p0303, I've recently changed my spark plugs, my ignition coils, and I've check my compression on all cylinders..( their all at 135-140psi) the code still won't dissapear, anyone have any input?

Answer 1

HI there,

I would check for intake manifold vacuum leaks and possible fuel injector issues. You may have a wiring issue to the coil as well, and if you used aftermarket coils, that could cause issues. Finally, make sure you don't have any coolant leaking into the cylinder.